Geez, too much, and for all you know the poster does not even knowwhat Z_n means. How about using what you suggest for (b) and (c), andthen using (a) for (b) and (c)?

>For parts (b) and (c), read up on the Euclidean algorithm. Using the

-- ======================================================================"It's not denial. I'm just very selective about what I accept as reality." --- Calvin ("Calvin and Hobbes" by Bill Watterson)======================================================================